To adjust the flow rate, lift the UltraStream and place it gently on its side. You will see a plate on the bottom with two holes.
Place your fingers inside the holes and pull to remove the base plate and expose the blue flow control valve.
To fully open the valve, move the blue lever so that it is pointing in the direction of the inlet hose. Replace the base plate, being careful that it is fully clicked into place and aligned with the valve.